// stocks.cpp -- the whole program
#include <iostream>
#include <cstring>

class Stock
{
	private:
		char company[30];
		int shares;
		double share_val;
		double total_val;
		void set_tot()
		{
			total_val = shares * share_val;
		}
	public:
		void acquire(const char * co, int n, double pr);
		void buy(int num, double price);
		void sell(int num, double price);
		void update(double price);
		void show();
		~Stock();
};

Stock::~Stock()
{
	std::cout << "Bye, " << company << "!\n";
}

void Stock::acquire(const char * co, int n, double pr)
{
	std::strncpy(company, co, 29);
	company[29] = '\0';
	if (n < 0)
	{
		std::cerr << "Number of shares can't be negative. "
			<< company << " shares set to 0.\n";
		shares = 0;
	} else {
		shares = n;	
	}
	share_val = pr;
	set_tot();
}

void Stock::buy(int num, double price)
{
	if (num < 0)
	{
		std::cerr << "Number of shares purchased can't be negative. "
			<< "Transaction is aborted.\n";
	} else {
		shares += num;
		share_val = price;
		set_tot();
	}
}

void Stock::sell(int num, double price)
{
	using std::cerr;
	if(num < 0)
	{
		cerr << "Number of shares sold can't be negative."
			<< "Transaction is aborted.\n";
	} else if(num > shares) {
		cerr << "You can't sell more than you have! "
			<< "Transaction is aborted.\n";
	} else {
		shares -= num;
		share_val = price;
		set_tot();
	}
}


void Stock::update(double price)
{
	share_val = price;
	set_tot();
}

void Stock::show()
{
	using std::cout;
	using std::endl;

	cout << "Company: " << company
		<< " Shares: " << shares << endl
		<< " Share Price: $ " << share_val
		<< " Total Worth: $ " << total_val << endl;
}


int main()
{
	using std::cout;
	using std::ios_base;
	Stock stock1;
	stock1.acquire("NanoSmart", 20, 12.50);
	cout.setf(ios_base::fixed);
	cout.precision(2);
	cout.setf(ios_base::showpoint);
	stock1.show();
	stock1.buy(15, 18.25);
	stock1.show();
	stock1.sell(400,20.00);
	stock1.show();

	return 0;
}


